Manufacture of new products derived from cellulose



No Drawing.

TES

PATENT OFFICE.

PAUL EMILE CHARLES GrOIIISSEDET, 0F PARIS, FRANCE.

It has been found that this reaction can be applied to cellulose.

If for example phenyl isocyanate is allowed to act upon cellulose in thepresence of tertiary bases the cellulose is transformed into phenylcarbamic esters, whichcan be applied to the same uses as the celluloseesters.

By way of example; 1 part of dried cot ton cellulose and 3 parts phenylisocyanate diluted with dry pyridin are heated together. The cottonfibers disap ear and a colloidal solution is obtained rom which theresulting phenyl carbamic ester is easily isolated.

Phenylisocyanate can be replaced by any aliphatic or aromaticisocyanates. J v v The process may be carried out in the presence oftertiary bases either singly or intermixed. y

The dilution may be effected with any suitable solvent.

What I claim as new and desire to secure by Letters Patent of the UnitedStates 1s 1. The process for the production of new derivatives .ofcellulose which comprises treating cellulose with an isocyanic ester.

2. The process for the production of new derivatives of cellulose whichcomprises treating cellulose with an aromatic 1S0- oyanic ester.

Specification of Letters Patent.

MANUFACTURE OF NEW PRODUCTS DERIVED FROM GELLULOSE.

Patented Nov. 2, 1920.

Application filed March 4, 1919. Serial No. 280,566.

' 3. The process for the production of new derivatives of cellulosewhich comprises heating cellulose with an isocyanic' ester in thepresence of a tertiary base.

4 The process for the production of new derlvatlves of cellulose whichcomprises heating cellulose with an aromatic isogyamc ester in thepresence of a tertiary ase. I

5. The process for the production of new derivatives of cotton cellulosewhich com prises heating dried cotton. cellulose with about three timesits weight of an isocyanlc ester 1n the presence of anhydrous pyridinand separatingout the resulting cari bamic'ester.

6. The process for the production of new derivatives of cellulose whichcomprises heating cellulose with an isocyan ic ester in the presence ofpyridin, and separating out the resulting carbamic ester. 7. The processfor the production of new derivatives 'of cellulose whichcomprisesheating dried-cotton cellulose with an iso cyanic ester in the presenceof a tertiarybase, and separating out the resultingcarbamic ester. i

8. The process for the production of new derivatives of cellulose whichcomprises heating cellulose with phenyl i'socyanate in f the presence ofa tertiary base, and separating out the resulting phenyl 'carbamicester.

9. The process for the production of new derivatives of cellulose whichcomprises heatingwellulose with phenyl-isocyanate in the presence ofpyridin, and separating out the resulting phenyl carbamic ester. I

10. The process for the production of the new derivatives of cellulosewhich comprises .heating cellulose with an aromatic isocyanic ester inthe presence of pyridin, and separating out the resulting carbamicester.

11. As an article of manufacture the new specification. I

PAUL EMILE CHARLES GOISSEDET.

